The Collaborative International Dictionary of English v.0.48:

Zygophyllum \Zy`go*phyl*lum\, prop. n.
   1. A genus of usually tropical herbs or shrubs having
      ill-smelling foliage and flower buds that are used as
      capers: bean capers.

   Syn: genus Zygophyllum.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Zygophyllum
    n 1: usually tropical herbs or shrubs having ill-smelling
         foliage and flower buds that are used as capers: bean
         capers [syn: Zygophyllum, genus Zygophyllum]